JP2002195858A - Display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display capable of suppressing cost increase and capable of lightening restrictions on color conversion. SOLUTION: This display is equipped with a light emitting diode (first light emitting diode) 6, a display part 43 transmittingly illuminated with an illumination color different from the luminescent color of the diode 6, an illumination chamber 8 interposed between the display part 43 and the diode 6 to guide the light from the diode 6 to the display part 43, and a fluorescent reflection film 9 formed on a wall surface of the chamber 8 to color-convert the light going to the display part 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device mounted on various moving bodies such as automobiles, motorcycles, ships, agricultural and construction machines, and aircraft, and illuminating and displaying a predetermined display section by turning on a light source.

[0002]

2. Description of the Related Art Conventionally, various display devices are mounted on a dashboard of an automobile, for example, and one of them is a combination meter. This combination meter includes various types of meters for displaying various types of measured values, for example, vehicle speed, engine speed, cooling water temperature, fuel, and the like.
For example, a display device for displaying a mileage, an outside temperature, and the like, an indicator for displaying information or warning information relating to the internal combustion system and the drive system, a switch operable by a driver, and the like are incorporated. These meters, indicators, indicators, and switches are provided with a light source for illuminating and displaying a display unit provided therein with a predetermined illumination color.

For example, in the case of meters, if the meter is a pointer type meter, as shown in FIG. 6, a pointer 01 which rotates around an axis according to a measured amount, and a panel located behind the pointer 01 A display unit 04 is constituted by a scale unit and an index unit 03 formed of characters on the member 02. These display portions 04 are formed of a light-transmitting material, for example, a transparent resin material in the case of the pointer 01, and a print layer of a light-transmissive ink in the case of the indicator portion 03.
2 is transmitted and illuminated by a light source 05 disposed behind the light source 2. As the light source 05, for example, an incandescent bulb (tungsten lamp) or a light emitting diode is often used.

An incandescent bulb (tungsten lamp) is a light source 05 which emits achromatic (white) light. Thus, the emitted light is colored, and the display unit 04 is transmitted and illuminated with an illumination color different from that of the light source 05.

On the other hand, light emitting diodes have the advantages of being small in size, generating less heat, and consuming less power than incandescent bulbs. In recent years, in particular, surface mount type light emitting diodes have tended to be used. The light emitting diode is a light source 05 that emits monochromatic light with a narrow wavelength range (wavelength distribution). When the display unit 04 is illuminated with colors as described above, a light emitting diode of a light emitting color that matches the illumination color is selected. Is common.

However, a light emitting diode that emits monochromatic light has a limited emission color. For example, an intermediate color other than the emission color of the light emitting diode may be required in some cases. In such a case, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 6-76823, it is possible to prepare a plurality of light-emitting diodes of different emission colors and realize the required color by mixing the emission colors emitted by them. Done. As in the case of the incandescent bulb, it is conceivable to pass the light through the color filter 06 to convert it into the required color. However, since the light emitting diode has a narrower wavelength range of the radiated light than the incandescent bulb, the simple color filter 06 requires Many of the wavelength components are absorbed by the absorption action, and the luminance may be remarkably reduced, or conversion into a desired color may be difficult. For this reason, there has been an attempt to use a fluorescent filter mixed with a fluorescent material, thereby not only absorbing emitted light but also exciting and emitting light to perform color conversion.

[0007]

However, as described above, a device that obtains a required color by a plurality of light emitting diodes as a mixed color not only causes an increase in cost due to an increase in the number of light emitting diodes, but also causes a mixed color. Therefore, it is difficult to control the current for each of the light emitting diodes to obtain the required color, and the driving circuit becomes complicated. In the case where a required color is obtained by the fluorescent filter, the color conversion is restricted by the fluorescent filter, and the color tone changes depending on the fluorescent material to be used and the film thickness of the filter itself.

The present invention has been made in view of this point, and a main object of the present invention is to provide a display device capable of suppressing an increase in cost and reducing restrictions on converted colors.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a light emitting diode, a display unit which is illuminated with a color different from the light emission color of the light emitting diode, a display unit and the light emitting diode. And an illumination chamber interposed between the illumination chamber and the display chamber for guiding light from the light-emitting diode to the display section, and a fluorescent reflection film formed on a wall surface of the illumination chamber and color-converting light reaching the display section. .

The present invention is also characterized in that the fluorescent reflection film absorbs the received light and emits light by excitation.

Further, the present invention is characterized in that the fluorescent reflection film converts received light into light having a long wavelength.

Further, the present invention is characterized in that the display section is provided on a panel member constituting a part of the illumination room, and the fluorescent reflection film is formed on the panel member.

Further, according to the present invention, the display unit is provided on a panel member constituting a part of the illumination room, and an illumination path from the light emitting diode to the panel member is provided between the panel member and the light emitting diode. A frame that surrounds and forms a part of the lighting room is provided, and the fluorescent reflection film is formed on at least one of a wall surface of the panel member or a wall surface of the frame body that can reflect light into the lighting room. It is characterized by.

Further, the present invention is characterized in that the light emitting diode is disposed on a substrate constituting a part of the illumination room, facing the panel member.

Further, the present invention is characterized in that the fluorescent reflection film is formed on a wall surface of the substrate capable of reflecting light into the illumination room.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to the present invention comprises a light emitting diode, a display section which is illuminated by an illumination color different from the light emitting color of the light emitting diode, and a display section interposed between the display section and the light emitting diode. An illumination room for guiding light from the light emitting diode to the display unit, and a fluorescent reflection film formed on the wall surface of the illumination room and color-converting light reaching the display unit,
The light reaching the display portion can be color-converted without using a plurality of light-emitting diodes of different emission colors, thereby suppressing an increase in cost. In addition, since color conversion can be performed without depending on the fluorescent filter, restrictions on the conversion color can be reduced, and color adjustment is easy. It is to be noted that the fluorescent reflection film and the fluorescent filter can be used in combination. Even in this case, the restriction on the conversion color can be reduced and the color adjustment can be easily performed by the fluorescent reflection film.

When the light emitted from the light emitting diode and reaches the display unit is received, the fluorescent reflection film absorbs the light, excites and emits light, converts the color, and reflects (radiates) the converted light toward the illumination room. Is what you do. It is desirable that the fluorescent reflection film not only absorbs the received light but also excites the emitted light and emits light of a color having a longer wavelength than the color of the received light upon excitation.

The display unit is optional if it is incorporated in various display devices and can be transmitted and illuminated by a light emitting diode (backlight illumination). For example, in the case of a pointer type meter, an instrument panel, a switch panel, or a key top is used. ,
In addition to the light-transmitting display portion partially formed on the indicator lens or the like, a light-transmitting member such as a pointer or a liquid crystal panel may be used.

When the display section is provided in a part of the panel member, a part of the illumination room can be constituted by the panel member, and a fluorescent reflection film can be formed on the panel member. In this case, the fluorescent reflection film can be easily and efficiently formed by being formed by printing means such as screen printing as in the other portions, and in this case, the fluorescent reflection film is formed by adding a fluorescent pigment or a fluorescent dye. Printing inks can be used. In addition, the formation position of the fluorescent reflection film can be provided in a region excluding a panel member corresponding to the display unit or in other regions including a position corresponding to the display unit.

Further, a frame member is provided between the panel member and the light emitting diode, wherein the lighting room surrounds a lighting path from the light emitting diode to the panel member and forms a part of the lighting room. And a circuit board on which a light emitting diode is mounted facing the panel member, at least one of a wall surface of the panel member, a wall surface of the frame, or a wall surface of the circuit board, and It may be formed in a region. Note that the lighting room can be formed of any member as long as it is interposed between the display portion and the light emitting diode and guides light from the light emitting diode to the display portion.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a display device according to an embodiment of the present invention;

FIG. 1 is a sectional view of a main part of a pointer type meter according to a first embodiment of the present invention, and FIG. 2 is a chromaticity diagram showing a color of light reaching a display unit.

In FIG. 1, a pointer type meter according to the present embodiment includes a circuit board (board) 1, an instrument main body 2, a frame 3, a panel member 4, a pointer 5, first and second light emitting diodes 6,7.
And

The circuit board 1 is formed of a hard paper phenol or glass epoxy circuit board, and a plurality of wiring patterns (not shown) made of a predetermined copper foil material are formed on the front side thereof. The instrument body 2 and the first and second light emitting diodes 6 and 7 are electrically connected.

The instrument main body 2 is mounted on the back side of the circuit board 1, and a drive shaft 21 and a terminal (not shown) that rotate in accordance with a measured amount, for example, a traveling speed, penetrate the circuit board 1 and move forward. And the terminals are connected by soldering to the wiring pattern.

The frame 3 is made of a white synthetic resin, is disposed on the circuit board 1 between the circuit board 1 and the panel member 5, and is located at a position facing the first light emitting diode 6. A first reflector 31 that reflects light from the first light-emitting diode 6 to the outer periphery; and a first reflector 31 that curves from the outer periphery of the first light-emitting diode 6 to the outer periphery of the panel member 5. The second reflecting the light from the side to the panel member 4 side
And the second light emitting diode 7 extending to the pointer 6 around the drive shaft 21 and the second light emitting diode 7
And a cylindrical portion 33 that guides the light to the pointer 5.

The panel member 4 is a plate material or a sheet material supported by the frame 3, and a light-shielding ground portion 42 is formed on the front side of a base material 41 made of a transparent synthetic resin by, for example, an ultraviolet curable ink. And a white translucent colored portion 44 forming a display portion 43 of scales, characters, marks, etc. corresponding to the hands 6 are formed by screen printing. In this case,
The translucent colored portion 44 is formed by printing on a blank portion where the ground portion 42 is not formed. A through-hole 45 is formed at a position corresponding to the center of rotation of the pointer 6 to enable the connection between the pointer 6 and the drive shaft 21.

The pointer 5 is formed of a transparent synthetic resin in a linear shape, and a colored portion 51 made of, for example, a red hot stamp layer is formed on the back surface thereof. Is formed, and the display unit 43 can be pointed by the drive shaft 21.

The first and second light-emitting diodes 6 and 7 are both surface-mount type, and the first light-emitting diode 6 emits blue light and transmits and illuminates the display unit 43 from behind. The light emitting diode 7 has a red emission color and a pointer 5
Is transmitted from behind. The light emitting diodes 6 and 7 may be of a type in which a pair of leads protrude from a shell-shaped synthetic resin mold, instead of a surface mount type.

Between the first light emitting diode 6 and the display unit 43, an illumination room 8 for guiding the light from the light emitting diode 6 to the display unit 43 by the panel member 4, the frame 3, and the circuit board 1 is provided. The panel member 4 which is formed and constitutes a part of the lighting room 8
Is provided with a fluorescent reflection film 9 on its wall surface.

The fluorescent reflection film 9 is made of, for example, a fluorescent ink in which a fluorescent material made of a fluorescent pigment or a fluorescent dye is mixed into an ultraviolet curable printing ink similar to the base portion 42 and the display portion 43. It is formed by screen printing on the back surface of the material 41, and in this embodiment, it is continuously attached to the periphery of the cutout portion 9a except for the cutout portion 9a avoiding the display portion 43 so as not to cover the display portion 43. Is formed. For example, when the fluorescent light reflecting film 9 directly receives the light emitted from the first light emitting diode 6, the fluorescent light reflecting film 9 absorbs the blue light and emits excitation light,
At the time of the excitation, the light is converted into yellow light having a longer wavelength than blue light, and is emitted (reflected) into the illumination room 8.

When the first and second light emitting diodes 6 and 7 are turned on in the pointer type meter configured as described above,
The pointer 5 is illuminated red by the second light-emitting diode 7, which emits red light, but the display unit 43 arrives directly without passing through the fluorescent reflection film 9 or reflected by the reflection units 31 and 32. And the converted light that reaches the converted light that has been converted by passing through the fluorescent reflective film 9 and passes through the translucent colored portion 44 made of white ink, so that the display portion 43 is formed.
Is illuminated.

At this time, the color of light reaching the display section 43 is as shown in FIG.
As shown in the figure, a blue coordinate point B, which is the emission color of the first light emitting diode, and a yellow coordinate point Y that is converted to a long wavelength by the fluorescent reflection film 9 are connected to or near a connection line L1. In the present embodiment, the light is a mixed color of light having color coordinates. In the present embodiment, the color coordinates of the mixed color are set, for example, in the vicinity of an achromatic (white) point C which is located substantially in the middle between the coordinate points B and Y. The achromatic light passes through the translucent coloring section 44, and the display section 43 is illuminated in white.

The fluorescent reflection film 9 can be formed not only on the panel member 4 but also on the frame 3 and the wall surface of the circuit board 1 constituting the lighting room 8. Adjusting the area where the fluorescent reflection film 9 is formed,
Alternatively, by adjusting the formation shape, the color of light reaching the display unit 43 can be set to an arbitrary color existing on or near the connection line L1 in FIG. That is, the coordinate point B which is the emission color of the first light emitting diode
By adjusting the formation area and the shape of the fluorescent reflection film 9 that converts the light at the coordinate point B into the light at the coordinate point Y with reference to
Balance (ratio) of blue light, which is the emission color of the first light emitting diode 6, and yellow light, which is the color converted by the fluorescent reflection film 9.
Can be adjusted, whereby an arbitrary color located on or near the connection line L1 can be set.

As described above, the display device according to the present invention comprises:
A light-emitting diode (first light-emitting diode) 6, a display unit 43 that is illuminated by a different illumination color from the light-emitting color of the light-emitting diode 6, and the display unit 43 and the light-emitting diode 6
The light from the light emitting diode 6 interposed between the
And a fluorescent reflection film 9 formed on the wall surface of the lighting room 8 and converting the color of light reaching the display section 43 without using a plurality of light emitting diodes 6 of different emission colors. In addition, the light reaching the display unit 43 can be color-converted, thereby suppressing an increase in cost.

Further, in this embodiment, since the color conversion can be performed without depending on the fluorescent filter by performing the color conversion through the illumination room 8 having the fluorescent reflection film 9, the restriction on the conversion color can be reduced. The range of selection or color adjustment can be expanded, and the degree of freedom in setting and adjusting the conversion color can be improved. Specifically, various colors can be set and adjusted by appropriately adjusting the formation region and the shape of the fluorescent reflection film 9, thereby improving the degree of freedom in color setting and color adjustment.

In this embodiment, a fluorescent reflection film 9 is formed on the panel member 4. In particular, the fluorescent reflection film 9 is formed by applying printing means such as screen printing in the same manner as other parts. The fluorescent reflection film 9 can be formed easily and efficiently, and cost reduction can be realized.

In this embodiment, when the fluorescent reflection film 9 is formed on the panel member 4, it is formed on the wall surface of the base material 41 on the side facing the illumination room 8 (the back surface of the base material 41). The fluorescent reflection film 9 may be formed between the ground portion 42 and the front surface side.

In this embodiment, the illumination room 8 is formed as a cavity. However, a light guide may be provided inside. At this time, a fluorescent reflection film 9 may be formed on the wall surface of the light guide.

FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 is a sectional view of a main part of a display device according to the present embodiment.
FIG. 4 is a chromaticity diagram showing the illumination colors of the display unit (liquid crystal panel). That is, in this example, the display device is a liquid crystal display device, and a liquid crystal panel (display unit) 10 and this liquid crystal panel 10
The display device is constituted by the illumination room 80 and the light emitting diode 60 constituting the backlight.

The liquid crystal panel 10 is of a transmissive type, and the illumination room 80 is composed of the liquid crystal panel 10, the circuit board (substrate) 1, and the frame 30.

The frame 30 has a first reflecting portion 310 which faces the light emitting diode 60 and reflects the emitted light to the right in FIG. 3, and a light from the first reflecting portion 310 side is applied to the liquid crystal panel. A second reflecting portion 320 that reflects light toward the side 10 is provided, and a fluorescent reflecting film 90 is formed on a wall surface of the second reflecting portion 320 by means such as painting.

In this embodiment, the light emitting diode 60 is a surface mount type light emitting diode that emits green light. The fluorescent reflection film 90 absorbs the light emitted from the light emitting diode 60 when the light is directly received. At the same time, the light is excited to emit light, and at the time of the excitation, the green light is converted into orange light having a longer wavelength and emitted.

As a result, the liquid crystal panel 10 transmits the illumination light of a mixed color of the direct light that arrives from the light emitting diode 60 without passing through the fluorescent reflection film 90 and the light that has undergone color conversion through the fluorescent reflection film 90. (Backlight) Illuminated.

At this time, the light reaching the liquid crystal panel 10 is
As shown in FIG. 4, on or near a connecting line L2 connecting a green coordinate point G, which is the emission color of the light emitting diode 60, and an orange coordinate point O, which is converted to a long wavelength by the fluorescent reflection film 9. In this embodiment, the light is a mixed color of light having color coordinates. In the present embodiment, the color coordinates of the mixed color are set in the vicinity of a coordinate point YG that is located substantially in the middle between the coordinate points G and O. The backlight is illuminated with a yellow-green illumination color.

By adjusting the area where the fluorescent reflection film 9 is formed, or by adjusting the shape of the area, the color of light reaching the liquid crystal panel 10 is present on or near the connection line L2 in FIG. Any color can be set
This is the same as the first embodiment.

According to this embodiment, as in the case of the first embodiment, it is possible to suppress an increase in cost and to expect effects such as improvement in the degree of freedom in color setting and color adjustment.

FIG. 5 is a front view of a main part of a display device according to a third embodiment of the present invention. In this embodiment, a light-shielding ground portion 420 is provided on a panel member 4 in a display device including a pointer-type meter. A translucent display section 430 formed by forming the ground section 420 in an annular shape in accordance with the rotation trajectory of the pointer 5; and a light-shielding or translucent display arrayed at predetermined intervals in the display section 430. Indicators 431 such as scales, characters, marks, etc.
In FIG. 5, a fluorescent reflection film 900 is provided on the back surface of the ground portion 420 located at the center, and three light emitting diodes 600 having a green emission color are arranged at equal intervals on the opposite surface. The illumination room (not shown) including the member 4 is formed behind the same as in the first embodiment.

In this case, the fluorescent reflection film 900 is connected to the display unit 4
It is formed by means such as screen printing so as to form a halftone dot (dot) in which the formation area and the shading are adjusted according to the 30 illumination colors. Then, when each light emitting diode 600 is turned on, the fluorescent reflection film 900 receives the emitted green light, converts the light into mainly yellowish green, yellow, yellow orange, and orange, and reflects the light. From the left side in the figure, a multi-color gradation illumination is performed mainly in the order of green, yellow-green, yellow-orange, and orange (so that the light gradually becomes longer wavelength). Is formed such that the longer the wavelength is (orange), the wider the formation area and the higher the density (the higher the density),
Further, a fluorescent reflection film 900 is provided in an area corresponding to the green illumination color.
Is not formed.

According to this embodiment, effects similar to those of the first and second embodiments can be expected, multi-color illumination can be performed with a single emission color, and gradation illumination can be performed. Performance can be improved.

In the first embodiment, the display section 43 is illuminated white using the fluorescent reflection film 9 for converting blue light to yellow light. In the second embodiment, green light is converted to orange light. In the case of illuminating the liquid crystal panel 10 serving as a display unit with yellow-green light using the fluorescent reflection film 90 that converts light into light, in the third embodiment, the formation form is adjusted so as to gradually convert green light into long wavelength light. Of the display unit 430 with multi-color illumination with gradation using the fluorescent reflection film 900 described above, respectively.
The color of light that reaches the display units 43 and 430 and the liquid crystal panel 10 through 900 and transmits and illuminates the display units 43 and 430 is
430 or the illumination color of the liquid crystal panel 10 can be appropriately set.

The present invention is effective for obtaining a luminescent color which cannot be obtained by the light emitting diode (chip element itself) as in the first embodiment, for example, and is not shown as another embodiment. However, for example, a light emitting diode having a yellow or orange emission color may be used to obtain an intermediate color between yellow and orange whose dominant wavelength on the chromaticity diagram falls within a range of 580 nm to 585 nm.

[0053]

As described above in detail, the present invention relates to a light emitting diode, a display unit which is transmitted and illuminated in a color different from the light emitting color of the light emitting diode, and an intervening portion between the display unit and the light emitting diode. An illumination room that guides light from the light emitting diode to the display unit, and a fluorescent reflection film that is formed on a wall surface of the illumination room and converts the color of light reaching the display unit, can suppress an increase in cost, Further, it is possible to provide a display device capable of reducing the restriction on the conversion color.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a display device according to a first embodiment of the present invention.

FIG. 2 is a chromaticity diagram showing a color of light reaching a display unit in the embodiment.

FIG. 3 is a sectional view of a main part of a display device according to a second embodiment of the present invention.

FIG. 4 is a chromaticity diagram showing illumination colors of a display unit (liquid crystal panel) in the embodiment.

FIG. 5 is a front view of an essential part showing a third embodiment of the present invention.

FIG. 6 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board (board) 2 Instrument main body 3, 30 Frame 4 Panel member 5 Pointer 6, 7 First and second light emitting diode 8, 80 Illumination room 9, 90, 900 Fluorescent reflection film 9a Opening portion 10 Liquid crystal panel ( Display part) 21 Drive shaft 31, 310 First reflective part 32 320 Second reflective part 41 Base material 42 (420) Ground part 43 (430) Display part 44 Transparent coloring part 60, 600 Light emitting diode 430 Display part 431 Index part B, Y, G, O, YG Coordinate point C Achromatic (white) point L1, L2 Connecting line

Claims (7)

[Claims] 1. A light-emitting diode, a display portion that is illuminated in a color different from a light-emitting color of the light-emitting diode, and light from the light-emitting diode interposed between the display portion and the light-emitting diode for displaying the light. A display device, comprising: an illumination room for guiding light to a display unit; and a fluorescent reflection film formed on a wall surface of the illumination room and converting the color of light reaching the display unit. 2. The display device according to claim 1, wherein the fluorescent reflection film absorbs the received light and emits excited light. 3. The display device according to claim 2, wherein the fluorescent reflection film converts the received light into light having a long wavelength. 4. The lighting device according to claim 1, wherein the display unit is provided on a panel member constituting a part of the illumination room, and the fluorescent reflection film is formed on the panel member.
The display device according to any one of the above. 5. The lighting device according to claim 1, wherein the display unit is provided on a panel member forming a part of the lighting room, and surrounds an illumination path from the light emitting diode to the panel member between the panel member and the light emitting diode. A frame constituting a part of an illumination room is provided, and the fluorescent reflection film is formed on at least one of a wall surface of the panel member or a wall surface of the frame body capable of reflecting light in the illumination room. The display device according to any one of claims 1 to 3, wherein the display device is a display device. 6. The display device according to claim 4, wherein the light emitting diode is disposed to face the panel member and is disposed on a substrate constituting a part of the illumination room. 7. The display device according to claim 6, wherein the fluorescent reflection film is formed on a wall surface of the substrate that can reflect light into the illumination room.